Here is the full list of all 26 Warhammer: Vermintide 2 achievements. It takes around 120-150 hours to unlock all of the achievements on Windows.
Equip a Veteran Item
Complete Skittergate on Legend
Reach level 30 with Bardin
Reach Level 30 with all characters
Complete Skittergate on Champion
Reach level 30 with Sienna
Reach level 30 with Kruber
Reach level 30 with Kerillian
Complete Skittergate on Veteran
Complete a level as every Hero
Complete Skittergate on Recruit
Reach level 30 with Saltzpyre
Salvage 100 items
Unlock all Talent points for 1 career
Complete Act 2
Equip Exotic items in every slot
Salvage an item
Complete Act 1
Complete Act 3
Equip a Common Item
Equip a Rare Item
Equip an Exotic Item
Complete Prologue
Unlock 1st Talent point
Craft an Item
Craft 50 items